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in PDF FormatLOW EXPANSION ALLOYS
42 ALLOY (ASTM F30)
Binary Alloy with low thermal expansion coefficient.
Used on: Leadframes for integrated circuits, thermostatic bi-metal strips
and glass to metal seals.
ALLOY 42 PHYSICAL PROPERTIES
SPECIFIC GRAVITY |
8.12 |
DENSITY, lbs. per cu. in. |
0.293 |
ELECTRICAL RESISTIVITY, MICRO-OHM-CM |
72 |
42 ALLOY TYPICAL NOMINAL CHEMISTRY
NICKEL (NI) |
39/41 |
CHROMIUM (CR) |
0.05 |
MANGANESE (MN) |
0.60 |
SILICON (SI) |
0.02 |
CARBON (C) |
0.05 |
ALUMINUM (AL) |
0.02 |
COBALT (CO) |
0.05 |
PHOSPHORUS (P) |
0.02 |
SULFUR (S) |
0.02 |
IRON (FE) |
BALANCE |
Note: Nickel varies to achieve the proper thermal expansion.
42 ALLOY TYPICAL TENSILE STRENGTH
(1,000 PSI)
ANNEALED |
85,000 MAX. |
¼ HARD |
90,000 to 115,000 |
½ HARD |
105,000 to 125,000 |
HARD |
120,000 MIN. |
TYPICAL HARDNESS, ROCKWELL B
ANNEALED |
70 MAX. |
¼ HARD |
78 to 83 |
½ HARD |
84 to 88 |
TYPICAL LINEAR COEFFICIENT OF THERMAL EXPANSION
(CM. PER CM. C x 10 – 6)
30 to 100 |
4.8 |
30 to 200 |
4.5 |
30 to 300 |
4.5 |
30 to 350 |
5.0 |
30 to 400 |
6.0 |
30 to 425 |
N/A |
30 to 450 |
7.0 |
30 to 500 |
8.0 |
30 to 550 |
8.8 |
30 to 600 |
9.5 |
30 to 700 |
10.5 |
30 to 800 |
11.4 |
30 to 900 |
12.3 |
30 to 1000 |
13.2 |